Changing Apple ID on App Store
How do I change the apple ID on my app store downloads. It has someone elses ID but I am signed in under my account.
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A request for another Apple ID password is often caused by updates to apps/purchases that were made when using the other ID. Those purchases are tied to the other ID and can't be transferred. One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID.
Purchase History Review. https://support.apple.com/en-us/HT204088